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7. Live footage of the Columbine High School massacre

Date: April 20, 1999

The United States still deals with the ramifications of the Columbine High School massacre every day, 13 years later. While the shootings weren't captured on live TV, the evacuations and SWAT team reactions were. A stunned nation tuned in to see kids escaping the school out of windows as heavily-armed policemen entered the building to take down any threat they felt still existed.

The footage of a school under siege is a sight most people felt they would never see in this country. There was no shocking violence or gore to be seen, but we can’t imagine anyone watching live without a lump in their throat.